What is Metadata?
Data about your data — for example, who you messaged and when, even if the message content itself is encrypted and private.
Even with end-to-end encryption, a service may know who you talk to, how often, from where, and for how long — and photos carry metadata too, including the location where they were taken. Metadata can reveal a surprising amount about your life. Privacy-focused apps minimise what they collect, and phones let you strip location data before sharing photos.